User Manual

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User's Guide

Digital Psychrometer + IR Thermometer

Model RH401

Introduction

Congratulations on your purchase of the Extech RH401 Digital Psychrometer + InfraRed

Thermometer. This device measures Humidity, Air Temperature, Dew Point and Wet Bulb.

Advanced features include Infrared Non-Contact Surface Temperature Measurement, Data

Hold and programmable Auto Power Off. The retractable probe protects the sensors when

the meter is not in use. Careful use of this meter will provide years of reliable service.

umi

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Summary of content (7 pages)

PAGE 1
User's Guide Digital Psychrometer + IR Thermometer Model RH401 DP Wb Humi C % Introduction Congratulations on your purchase of the Extech RH401 Digital Psychrometer + InfraRed Thermometer. This device measures Humidity, Air Temperature, Dew Point and Wet Bulb. Advanced features include Infrared Non-Contact Surface Temperature Measurement, Data Hold and programmable Auto Power Off. The retractable probe protects the sensors when the meter is not in use.
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Specifications Function Range and Resolution Accuracy Humidity 0.0 to 100.0% RH Temperature (Air) -4.0 to 122.0 F (-20 to 50 C) ±1.
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Operation Retractable Humidity and Air Temperature Sensor Press down on the sensor, located at the top of the meter, to release it. Humidity and air temperature will not be displayed if the sensor is not extended. After use, press the sensor into the stored (protected) position. Press Here Sensor Extended Power ON/OFF Press the (or the button) to turn power on. The meter will perform a short self-test when turned on. Press and hold the button for three seconds to turn power off.
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IR Emissivity Adjustment Emissivity is adjustable from 0.3 to 0.99. The default value is 0.95 which is the typical emissivity value of many non-metallic surfaces. If the surface to be measured is highly reflective and the emissivity is not known, cover the surface with paint or tape to improve measurement accuracy. If the emissivity of the surface is known, follow this procedure to set the value. 1. With the meter on, Press the key twice to enter the Emissivity setting procedure.
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Selecting temperature units of measure (C/F) o o Press and hold the C/ F button momentarily to toggle the temperature units. Automatic Power OFF The meter automatically shuts off after a programmed period of time. To disable auto power off, with the meter off, press and . When “n” appears, release the keys and the meter is now in Non-Sleep Mode. The power off time is adjustable from 5 to 600 seconds. To change the auto power off setting, press the key to enter the setting procedure.
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Calibration The following verification and calibration procedures require a humidity chamber. RH Accuracy Verification Checking the 33% or 75% RH Calibration 1. Insert the meter into a chamber set to 33% or 75%. 2. Check the reading after 10 minutes 3. Verify that the reading is within the accuracy specification. RH Calibration (33% and 75%) This two point calibration takes approximately three hours to complete. 33% Calibration 1. Turn off the meter and insert it into a chamber set to 33%. 2.
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RS-232 PC Communications Interface RS-232 data format Baud rate 9600 Parity none Data bits 8 Stop bits 1 Flow control none RS-232 Connection Connect the optional interface cable from the meter to the communications port of the PC. Using Windows® Terminal or HyperTerminal program for PC Communication The Terminal or the HyperTerminal program is included in all Windows® operating systems.